struts2增删改查

1、导入相关的依赖：struts、自定义标签库

配置pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com</groupId>
  <artifactId>strtus</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>strtus Maven Webapp</name>
  <url>http://maven.apache.org</url>
   <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
             <groupId>org.apache.struts</groupId>
             <artifactId>struts2-core</artifactId>
             <version>2.5.16</version>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jsp-api</artifactId>
            <version>8.0.47</version>
        </dependency>

    </dependencies>
  <build>
   <finalName>struts</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
  </build>
</project>

　　分页：

package com.util;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

public class PageBean {

	private int page = 1;// 页码
	private int rows = 10;// 行数/页大小
	private int total = 0;// 总记录数

	private boolean pagination = true;// 默认分页

	private String url;// 上一次请求的地址
	private Map<String, String[]> parameterMap;// 上一次请求的所有参数

	public PageBean() {
		super();
	}

	/**
	 * 对分页bean进行初始化
	 *
	 * @param request
	 */
	public void setRequest(HttpServletRequest request) {
		// 公共参数
		this.setPage(request.getParameter("page"));
		this.setRows(request.getParameter("rows"));
		this.setPagination(request.getParameter("pagination"));

		// 请求地址和请求参数
		this.setUrl(request.getContextPath() + request.getServletPath());
		this.setParameterMap(request.getParameterMap());
	}

	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public Map<String, String[]> getParameterMap() {
		return parameterMap;
	}

	public void setParameterMap(Map<String, String[]> parameterMap) {
		this.parameterMap = parameterMap;
	}

	public int getPage() {
		return page;
	}

	public void setPage(int page) {
		this.page = page;
	}

	public void setPage(String page) {
		if (null != page && !"".equals(page.trim())) {
			this.page = Integer.parseInt(page);
		}
	}

	public int getRows() {
		return rows;
	}

	public void setRows(int rows) {
		this.rows = rows;
	}

	public void setRows(String rows) {
		if (null != rows && !"".equals(rows.trim())) {
			this.rows = Integer.parseInt(rows);
		}
	}

	public int getTotal() {
		return total;
	}

	public void setTotal(int total) {
		this.total = total;
	}

	public void setTotal(String total) {
		this.total = Integer.parseInt(total);
	}

	public boolean isPagination() {
		return pagination;
	}

	public void setPagination(boolean pagination) {
		this.pagination = pagination;
	}

	public void setPagination(String pagination) {
		if ("false".equals(pagination)) {
			this.pagination = false;
		}
	}

	/**
	 * 下一页
	 *
	 * @return
	 */
	public int getNextPage() {
		int nextPage = page + 1;
		if (nextPage > this.getMaxPage()) {
			nextPage = this.getMaxPage();
		}
		return nextPage;
	}

	/**
	 * 上一页
	 *
	 * @return
	 */
	public int getPreviousPage() {
		int previousPage = page - 1;
		if (previousPage < 1) {
			previousPage = 1;
		}
		return previousPage;
	}

	/**
	 * 最大页码
	 *
	 * @return
	 */
	public int getMaxPage() {
		return total % rows == 0 ? total / rows : total / rows + 1;
	}

	/**
	 * 起始记录的下标
	 *
	 * @return
	 */
	public int getStartIndex() {
		return (page - 1) * rows;
	}

	@Override
	public String toString() {
		return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
	}

}

　　Dao层：

ClazzDao

package com.dao;

import java.util.List;

import com.entity.Clazz;
import com.util.BaseDao;
import com.util.PageBean;
import com.util.StringUtils;

public class ClazzDao extends BaseDao<Clazz>{
	public List<Clazz> list(Clazz clz, PageBean pageBean) throws InstantiationException, IllegalAccessException{
		String sql="select * from t_strtus_class";
		String cname=clz.getCname();
		if (StringUtils.isNotBlank(cname)) {
			sql+=" and cname like '%"+cname+"%'";
		}
	 return super.executeQuery(sql,  pageBean,Clazz.class);

	}
	 public int add(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
	        String sql="insert into t_struts_class values(?,?,?,?)";
	        return super.executeupdate(sql, new String[] {"cid","cname","cteacher","pic"}, clazz);
	    }
	    public int del(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
	        String sql="delete from t_struts_class where cid=?";
	        return super.executeupdate(sql, new String[] {"cid"}, clazz);
	    }
	    public int edit(Clazz clazz) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
	        String sql="update t_struts_class set cname=?,cteacher=?,pic=?";
	        return super.executeupdate(sql, new String[] {"cname","cteacher","pic","cid"}, clazz);

}
}

　　web层调用数据返回给前台

package com.web;

import java.sql.SQLException;
import java.util.List;

import com.dao.ClazzDao;
import com.entity.Clazz;
import com.util.BaseAction;
import com.util.PageBean;
import com.opensymphony.xwork2.ModelDriven;

public class ClazzAction extends BaseAction implements ModelDriven<Clazz>{

    private Clazz clz=new Clazz();
    private ClazzDao clzDao=new ClazzDao();
    public String list(){
        PageBean pageBean =new PageBean();
        pageBean.setRequest(request);
        try {
            List<Clazz> list = this.clzDao.list(clz, pageBean);
            request.setAttribute("clzList",list);
            request.setAttribute("pageBean",pageBean);
        } catch (InstantiationException | IllegalAccessException | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "list";

    }
    /**
     * 跳转编辑页面
     * @return
     */
    public String preSave() {
        if(clz.getCid()!=0) {
            try {
                this.result= this.clzDao.list(clz, null).get(0);

            } catch (InstantiationException | IllegalAccessException | SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return "preSave";

    }
    public String add() {
        try {
            this.code= this.clzDao.add(clz);
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
                | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";

    }
    public String edit() {
        try {
            this.clzDao.edit(clz);
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
                | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";

    }
    public String del() {
        try {
            this.clzDao.del(clz);
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException
                | SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "toList";

    }

    @Override
    public Clazz getModel() {
        // TODO Auto-generated method stub
        return clz;
    }
}

　　配置strtus-sy.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
    "http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
    <package name="sy" extends="base" >

    <action name="/clz_*" class="com.web.ClazzAction" method="{1}">
      <result name="list">/clzList.jsp</result>
      <result name="preSave">/Edit.jsp</result>
      <result name="toList" type="redirectAction">/clz_list</result>
    </action>
    </package>
</struts>

　　JSP

clzList.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@taglib prefix="z" uri="/lingerqi"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <h2>小说目录</h2>
    <br>

    <form action="${pageContext.request.contextPath}/sy/clz_list.action"
        method="post">
        书名：<input type="text" name="bname"> <input type="submit"
            value="确定">
    </form>
    <a href="${pageContext.request.contextPath}/sy/clz_preSave.action">增加</a>
    <table border="1" width="100%">
        <tr>
            <td>编号</td>
            <td>班级名称</td>
            <td>老师</td>
            <td>班级图片</td>
        </tr>
        <c:forEach items="${clzList }" var="b">
            <tr>
                <td>${b.cid }</td>
                <td>${b.cname }</td>
                <td>${b.cteacher }</td>
                <td>${b.pic }</td>
                <td><a
                    href="${pageContext.request.contextPath}/sy/clz_preSave.action?cid=${b.cid}">修改</a>  
                    <a
                    href="${pageContext.request.contextPath}/sy/clz_del.action?cid=${b.cid}">删除</a> 
                    <a
                    href="${pageContext.request.contextPath}/sy/clz_preUpload.action?cid=${b.cid}">图片上传</a> 
                </td>
            </tr>
        </c:forEach>
    </table>
    <z:page pageBean="${pageBean }"></z:page>
</body>
</html>

　　edit.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}${result.cname == null ? '/sy/clz_add.action' : '/sy/clz_edit.action'}" method="post">
   cid:<input type="text" value="${result.cid }" name="cid"><br>
   cname:<input type="text" value="${result.cname }" name="cname"><br>
  cteacher:<input type="text" value="${result.cteacher }" name="cteacher"><br>
   <input type="submit" value="ok">
</form>
</body>
</html>